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Cobalt(II), Nickel(II), Copper(II) and Zinc(II) Complexes with New Tetraaza Schiff Base Ligands: Synthesis, Characterization and Thermodynamic Studies

M. Asadi^a,*, G. Absalan^a and A. Zamanpour^a

^aChemistry Department, College of Sciences, Shiraz University, Shiraz 71454, I. R. Iran

New complexes of Co(II), Ni(II), Cu(II) and Zn(II) with four new tetraaza Schiff base ligands, N,N'-bis(2-quinolylmethylidene)-1,2-ethanediimino (L¹), N,N'-bis(2-quinolylmethylidene)-1,2-propanediimino (L²), N,N'-bis(2-quinolylmethylidene)-1,3-propanediimino (L³), N,N'-bis(2-quinolylmethylidene)-4-nitro-1,2-phenylenediimine (L⁴), were synthesized and characterized by elemental analysis, IR, ¹H NMR, and UV-Vis spectroscopy. The thermodynamic formation constants of the complexes were measured spectrophotometrically, at the constant ionic strength 0.1 M (NaClO₄), at 25 °C in MeOH solvent. The trend of the complex formation of a given metal ion with the ligands was found to be as follows L² > L¹ > L³ > L⁴ and the trend of a given ligand with the metal ions was Co(II) > Ni(II) > Cu(II) > Zn(II).

Keywords: Complexes, Formation constants, Thermodynamic parameters, Tetraaza Schiff base